Calculating device



oef. 19, 1943. H. ERNST ET AL CALCULATING DEVICE Filed Sept. 8, 1941 2 Sheets-Sheet 1 he m. hww @@IN QB@ @S Oct. 19, 1943. H. ERNST ET AL 2,331,967

CALCULATING DEVICE INVENTOR.

ATTORNEY.

Patented Oct. 19, 1943 CALCULATING DEVICE Hans Ernst and Raymond D.

cinnati, Ohio,

tion oi' Ohio Wortendyke, Cinixnorl to The Cincinnati Milling Machine Co., Cincinnati,

Ohio, a corpora- Application September 8, 1941, Serial No. 409,978

8 Claims. (Cl. 23S-84) This invention relates to improvements in calculating devices and has particular reference to a novel and improved device for utilization in rate determination of the speeds and feeds to be selected for proper performance of milling, grinding or like machining operations.

One of the principal objects of the present invention is the provision of an improved device so constructed and arranged as to enable a machine operator, layout man or the like having knowledge of certain iixed factors, such as diameter of a rotating member and material of work and cutter, accurately to determine the proper rotative speed, feed rate and horsepower requirements for given depths of cut without the necessity of performing complicated mathematical calculations.

A further object of the present invention is the provision of a device of this character which will be of simple and compact form embodying a minimum number of relatively adjustable parts, each capable of performing multiple functions in determination of the essential speed and feed selections.

A further object of the present invention :is the provision of a device basically constructed from transparent materials which shall present smooth, unbroken exterior surfaces and in which the arrangement of interior opaque and trans-- parent portions shall be such as to blank out to Y a maximum degree the transmitted visibility oi' various indicia not utilized in determination ci' any particular factor or combination of factors. A further object of the present 'invention is the provision of a device of the character indi cated with suitable indicia, such as corresponding colorings common to jointly movable indicia bearing portions and the actuators therefor and dis= tinct as respects separate actuators and their actuated parts whereby the part to be actuated for eecting a given reading or combination of readings is directly graphically indicated,

Other objects and advantages of the present invention should be readily apparent by reference to the following speciication, considered in conjunction with the accompanying drawings form ing a part thereof and it is to be understood that any modifications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to thel drawings in which like refer ence numerals indicate like or similar parts:

Figure 1 is a front view of a device constructed in accordance with and embodying the principles of the prsent invention.

Figure 2 is a similar view of the opposite face thereof.

Figure 3 is a. diagrammatic sectional view oi' the parts in exaggerated thickness to bring out theirrelative relationship taken as on the line 3-3 of Figure l.

Figure 4 is a view of one of the movable elements removed with the indicia which is shown in detail in Figure 2 of the drawings diagrammatically indicated in part.

Figure 5 is an enlarged fragmentary view ci essential structural features of the lower portion of the structure as viewed in Figure l, and

Figure 8 is a view of the circular adjustable member viewed as in Figure l but rotated 180 degrees.

Figure i is a partial view oi the opposite side of the circular member shown in Figure 6.

MRLING FEED CALcULAros In the performance of machining operations for stock removal most eicient operation can usually be eifected by causing a relative rotation between the work piece and cutter, together with a feeding movement causing relative traverse ci the parts.

In a grinding machine, lathe, boring machine or the like, the rotative movement may be lmparted to the work piece while the cutter is either stationary or preferably driven in opposition to the movement of the work piece, while in a milling machine the cutting action is produced by a rotating cutter, the work ordinarily being nonrotatlve. In either instance, suitable feeding mechanism is provided to cause relative movementusually axially between the work and cutter so that the desired surface to be machined may be properly traversed.

in the form oi invention chosen for purposes of illustration, there has been shown a calculator particularly adapted for utilization in connection with milling or like operations.

Best 'to preserve the device against soiling, smearing or the like, while facilitating its production in compact form such that it can be readily carried in the pocket or used on the drafting table or the like, the device is preferably constructed from a pair o outer plates or sheets it and ii of Celluloid or similar exlble trans- A parent material.

These plates are preferably similar in contour,

ate notches formed as at I2 and I3 through which the edges of an interposed rotary member I4 extend for actuation purposes and having the additional arcuate notch I5 at one end through which projects the actuating portion I6 of the plate or member I1.

Underlying the member II is. an opaque sheet -I8 preferably suitably united with the plate II to form a unitary piece of material. The sheet I3 is provided with an arcuate slot or Window I 9 for affording visibility of the underlying member I1, and with a concentric circular Window airording visibility of the rotary member or disc I4 by way of an arcuate slot or window 2I in the intervening member I1. The lower edge of the window 20 is additionally cut away in the form of an arcuate slot portion 20a to permit visibility of indicia on member I4 by way of the arcuate slot or window 23 in member I1. The sheet I8 also provides an opaque strip 24 between windows I9 and 20 -)which bears indicia 53 for cooperation with certain indicia on disc I4, and also serves to blank out the indicia. visible through slot 23 when disc I4 is rotated to position another set of indicia thereon beneath the window 23.

Considered from the reverse side as viewed in Figure 2, the transparent member III has the underlying opaque backing sheet 25 which is provided with a small arcuate slot or Window 26 for affording visibility of a portion of the reverse side of member I4. An index I1Il is arranged at the edge of the window 26 to coact with the diameter of cutter scale I1I which is on the disc I4, the scale being shown in full in Figure 7. The sheet 25 is also provided with a central circular window 21 through which the back of disc I1 is visible through the transparent portions 28 and 29 of member I4.` In addition, the sheet 25 provides a third Window opening 30 which is a continuation of the window 21 to provide visibility of indicia |65 on the reverse side of disc I4.

The lower portion of the sheet 25 has a small window opening disposed concentric with but of greater diameter than the disc I4 to provide visibility of indicia 66 on the back of member I1 which are adapted lto register with a fixed index I12 on cover plate I Il.

The member I1, it will be noted, is formed of a pair of transparent disc-like portions 32 and 33 with an intervening opaque sheet 34 in which the slot or window portions 2| and 23 are formed,

`the areas` Ila, I'lb and llc being opaque and is tirety by the reference character I4 comprises the transparent discs 31 and 33 with the intervening opaque unit 39 having the large circular windowl or aperture as at 40 underlying window The several parts just described are centrally perforated to receive the hollow rivet 4I which provides a pivot about which the members "I4 and I1 may be rotated, suitable spacers 42, 43 and 44 intervening the rotating elements and the outer plates so that these elements may freely rotate with respect to each other without being relatively frictionally actuated.' Additionally, and in the interests of maintaining the members I4 and I1 in proper close relationship to the overlying plates or elements I0 and II, and at the same time prevent interfrictional engagement, there is centrally interposed between the members I4 and I1 a transparent plate 45 having an enlarged central aperture as at 46 to avoid interference with the visibility through the windows ot the other indicia bearing members.

Suitable spacers, such as 41 and 43, 'retain the side plates I0 and II in suitably spaced relationship so that the entire device may be secured together in a rigid unit at the corners as by the fastening devices 49.

It will be particularly noted by reference to Figure 3 that while the structural features just described provide a vmultiplicity of circular and arcuate windows or transparent portions with the parts variably aligned or proportioned so that the shiftable central members may be seen in part through, by way of, lor peripherally around each other, that the various opaque or blanking portions are so disposed that the device as an entirety presents a general opaque appearance with the windows disposed concentric but at different radial distances.\

On account of this construction, the various indicia carried by the respective discs or elements and visible through the windows clearly stand out under all conditions of use and in practically all instances are so protected by duplex, overlying opaque portions on different elements that a series of ,clear readings may be obtained at either side of the device even though the same was being held toward the light and no interference is effected by blanked out indicia or indicia intended for use at the opposite side of the calculator.

For an understanding of the manner of utllization of the device in question, reference will first be made to Figure' 1. This phase of the device, it will be noted, is particularly intended to enable a layout or time study man or an operator to determine the various essential facts regarding feed rate to be employed in performance of a particular machining operation.

At the uper portion is provided a block as at 50 containing directions for utilization of the device which for simplification of the drawings has been marked with indicia reading, Directions for use, which detail directions may, for example, read substantially as follows:

Milling feed calcuator To nd:

Feed/tooth- 1. Set number of teeth in cutter to desired R. P. M. by rotating red disc.

2. Opposite any feed rate read the corresponding feed per tooth. Horsepower- 1. Set work material to proposed feed 'rate by rotating blue sector. 2. Opposite depth of cut read the horsepower per inch of width. Feed/rev.-

1. Set feed per rev. index to the desired R. P. M. by rotating red disc. 2. Opposite proposed feed rate read corresponding feed per rev.

Intermediate these directions and the window I 9 in the member II are means in the form of indicia 5I logarithmically arranged indictative ot requisite horsepower at cutter per inch of width of cut being taken.

Formed on the member I1 at the upper arcuate portion thereof in underlying relation with winfor different depths of cut. Immediately below l window I9 is the arcuate strip 24, in tum provided with indicating means in the form of a logarithmic scale indicative of potential revolutions per minute oi the cutter as determinable, for example, through utilization of the reverse side of the device as particularly illustrated in Figure 2. l

It willbe noted that the member ii is provided with a large window 20, while the underlying member i1 has an arcuate window 2i through which an arcuate zone 'or portion of member ifi may be viewed. Member lli, as particularly brought out in connection with Figures i and 6, is provided with a plurality of indicia selectively coupled with the revolution indicating indicia 53 and feed rate indicating indicia. 5t of inemn ber i l.

' Infone effective position of operation of the member i4, pointer 55, designated as Feed per revolution index" may be selectively aligned with the desired revolutions per minute of the cutter as indicated by indicia 53 and when so aligned will cause suitable positioning of the series of indicia 56, on the diametrically opposite' portion ci the disc'which show feed per revolution in inches (or thousandthsof an inch) with the feed rate scale 54.

Alternatively, if the disc it be rotated 180 dem grecs the graduations 51 designated as number of teeth in cutter will be brought beneath window 2i and the graduations 58 indicative of feed per tooth in inches will be brought into registry with the scale 54 of feed rate in inches.

The wider portion as at 59 ci' member il serves alternatively to blank pff the feed revolution pointer or the teeth in cutter indications, while the arcuate portion 24 of member il similarly blanks out either the feed per tooth or the feed per revolution indicia.

As a result, but one set is available for joint utilization at any time but by suitable rotation oi the member ld the cooperating pairs may be alternatively disposed in operative position. The central portion of member il, it is to be noted, is provided with a plurality of 'indicia Sil indicaJ tive oi various work materials to be machined and bears a-plurality of logarithmically spaced pointers or indicators El formed on the opaque element 3d thereof and aligned in dash. or other indicating lines 62 as shown in Figure 5 in a subn stantially radial direction across window for registry with the feed rate scale, the work ina-z terial to be operated upon having thus its designator ti-Z brought ,into alignment with a selected aligned rate by oscillation of the mein ber il. The horsepower at cutter required per inch ci width of cut in the particular material for a selected depth of cut may then be read from the cooperating indicia 5i and 52.

MILLING SPEED INDICATOR tral portion 63 of member Il through the eenu tral portion of which is visible the reverse side of member l1 bearing the work material designations 44, separated by indicating lines 84a, intervening terminal designation lblocks 64b circumferentially therebeyond through the lower portion of the window is visible the portion I5 of member i4 bearing an arcuately arranged series of indicia |65 indicated as representing revolutions per minute of a rotary member such l as a cutter or work piece and cooperating with the cutting speed, feet per minute indicia |66 on member l0.

Additionally, the member i0 'has a lower win dow 3| disposed beyond the periphery of member i4 through which the reverse side of member il is visible, having disposed thereon at suitably spaced positions indicia such as 66 reading in terms of various materials oi cutter which can be employed in the machining operation.

The member i0 is likewise provided with a suitable series of indicia asat 6l containing directions for use of this side of the device which may, for example, read substantially as follows:

"Milling speed calculator To find: Revolutions per minute and cutting speed 3. Follow to left -from selected work material to read the recommended R. P. M. on red scale and corresponding cutting speed on black scale" It will'be noted that in all instances the several scales on the various relatively adjustable meinbers and `their positioning determining means, such as registering pointers, graduations or the bha/are so angularly positioned and logarithmi cally proportioned that for any given adjustment a complete series of readings oi" the relative variables can be effected.

it will further be noted that to facilitate termination of the member to be adjustei foy effecting a desired result that the reading meniglzer, pointers, designation blocks and peripheral actuating portions of the members lll and are correspondingly colored as, for example, the several elements referred to of member l@ being marked in red and those of il in blue as indi-2 cated to the extent possible by conventional sym bols, particularly in connection v with enlarged views fi, 5 and t o the drawings.

'For instance, the periphery of the member ifi is providectwith a series of small blocks i (l5 'which are colored red and to distinguish this color are vertically hatched, while the periphery of the member il is provided with a series of blocks which are colored blue and to disn tinguish this color these squares are horizontally hatched. Thus, the projecting edges of these members as shown in Figures l and Zlwill display the respective colors of these members and indicate 'to the user the proper one to rotate, in cordance with the directions for use.

On account of this correspondence of designa tion by color or otherwise between the peripheral actuating portionsl of the respective discs or oscillatable members and the designations thereon visible through the respective windows or transparent portions of the outer plates with separate end vand side locations of said actuating portions, 'the user of the device can instantly determine which actuator to utilize for eiecting any desired relative positioning of the several parts of the device.

` ent sections thereof, said body element having indicia disposed thereon in the form of a logarithmic scale reading in horsepower at cutter, disposed adjacent at one of the arcuate transparent portions thereof, the pivoted element having an opaque portion underlying said transparent arcuate portion provided with logarithmically arranged indicia indicative of depth of cut in position for cooperation with the horsepower indications on the main element, the main element having an additional series of logarithmically arranged feed rate designations adjacent another of the arcuate transparent portions thereof and the pivoted member lhaving a series of blocks formed thereon for reception of indicia designating different work materials, said blocks terminating in pointers logarithmically spaced in aclcordance with the variantsl in machinability characteristics of the several work materials, whereby selective registration of the pointers and feed `rate indicia Will eifect proper relative positioning of the depth of cut and horsepower indicia, a second member pivoted in underlying relation to the rst having portions visible through the aligned transparent arcuate areas visible y through the aligned transparent portions `of the of the base element and rst pivoted member adjacent the feed rate scale and a feed per tooth scale additionally carried by the second pivoted member in opposition to the tooth scale thereon and positionable beneath the joint transparent portions of the base element and first pivoted member when said member is rotated to bring the tooth scale in cooperative relation with the revolution scale.

2. A device of the character described comprising a body element having a central transparent portion and a plurality of arcuate transparent portions, a member pivotally secured to the body element and disposed in underlying relation thereto, said pivoted member having opaque portions underlying certain of the transparent portions of the ilrst element and transparent portions underlying certain of the arcuate transparent sections thereof, said body element having indicia disposed thereon in the form of a logarithmic scale reading in horsepower at cutter, disposed adjacent at one of the arcuate transparent portions thereof, the pivoted element having an opaque portion underlying said transparent arcuate portion provided with,

logarithmically arranged indicia indicative of depth of cut in position for cooperation with the horsepower indications .on themain element. the main element having an additional series of logarithmically arranged feed rate designations adjacent another of the arcuate transparent portions thereof and the pivoted .member having a series of blocks formed thereon for reception of indicia designating different work materials, said blocks terminating in pointers logarithmically spaced in accordance with the variants in machinability characteristics of the several work materials, whereby selective registration of the pointers and feed rate indicia will eil'ect proper relative' positioning of the depth of cut and horsepower indicia, a second member pivoted in underlying relation to the ilrst having portions visible through the aligned transparent arcuate areas visible through the aligned transparent portions of the base element and first pivoted member, a revolution scale carried by the base element adjacent one of said aligned transparent portions, a feed per revolution pointer and a logarithmic cutter tooth scale carried by thesecond pivoted member and selectively positionable beneath the joint transparent apertures in proximity to the revolution scale on the base member, a feed per revolution scale formed on said second pivoted member disposed in opposition to the pointer for visibility through the aligned transparent portions of the base element and ilrst pivoted member adjacent the feed rate scale and a feed per tooth scale additionally carried by the second pivoted member in opposition to the tooth scale thereon and positionable beneath the joint transparent portions of the base element and rst pivoted member when said member is rotated to bring the tooth scale in cooperative relation with the revolution scale, each of said rotatable members having operating portions projecting laterally of the base element, and corresponding visible designations carried by the operating portions and indicating portions of the respective pivoted members for visual determination of the actuating portion to be operated for effecting adjustment of a desired series of shiitable indicia with respect to the several scale portions of the base element.

3. A device of the character described comprising a body element having a central transparent portion and a plurality of arcuate` transparentportions, a member pivotally secured to the body element and disposed in underlying relation thereto, lsaid pivoted member having opaque portions underlying certain'of the transparent portions of the first element and transparent portions underlying certain of the arcuate transparent sections thereof, said body element'having indicia disposed thereon in the form .of a logarithmic scale reading in horsepower at cutter, disposed adjacent at one of the arcuate l assise?. A y f 5 materials. whereby selective registration ot the pointers and feed rate indicia will eiect proper relative positioning of the depth of cut and horsepower indicia, a second member pivoted in underlying relation to the iirst having portions visible through the aligned transparent arcuate areas visible through the aligned transparent portionsl of the base element and iirst pivoted member, a revolution scale carried by the base element adjacent one of said aligned transparent portions, a feed per revolution pointer and a logarithmic cutter tooth scale carried by the second pivoted member and selectively positionable beneath the joint transparent apertures in proximity to the revolution scale on the base member, a feed per revolution scale formed on said second pivoted member disposed in opposition to the pointer for visibility through the aligned transparent portions of the base element and rst pivoted member adjacent the feed rate scale and a feed per tooth scale additionally carried by the second pivoted member in opposition to the tooth scale thereon and positionable beneath the joint transparent portions of the base element and iirst pivoted member when -said member is rotated to bring the tooth scale in cooperative relation with the revolution scale, the alternatively available indicia of the second rotatable member being disposed in overlying concentric groupings and the overlying base element and rst pivoted element having oppositelv disposed arcuate opaque portions for blanking out one or the other of the groupings of indicia on the second rotatable member in any position of rotation of the latter whereby selected pairings only of said indicia will be brought into registry with the respective transparent portions of the overlying members in any position of rotation of the second rotatable member.

4. A device of the character described, including a pair of opaque body elements each having a plurality of transparent portions formed therein-including a central circular transparent portion and a plurality of concentrically disposed arcuate transparent portions, the arcuate portions of the respective members being disposed at diiierent radial distances from the axis of the central circular transparent portions, and an adjustable member pivoted between the body elements cony centric with the transparent Windows thereof, said member having an opaque central portion blanking the circular transparent portions oi both of said body elements and bearing on opposite sides of said opaque central portion a series of blocks containing indicia designating various work niaterials, said blocks terminating in indicators proportionally spaced in accordance with the machinability characteristics of the several materials designated within the blocks, and means providing rate designating indicia formed on the opa-due portions of the body elements for cooperation with said indicators in various rotative adjusted positions of the intermediate member about its pivot, said intermediate member having additional indicia bearing portions visible .through arcuate outer transparent portions of the respective body elements and indicating means on the body elements adjacent said windows for cooperation with the indicia on the pivoted member as visible through said arcuate transparent portions, substantially as andior the purpose described.

5. A device of the character described, including a pair of opaque body elements each having a plurality of transparent portions formed therein including a central circular transparent portion and a plurality of concentrically disposed arcuate transparent portions, the arcuate portions of the respective members being disposed at diilerent radial distances from the`axis'of the central circular transparent portions, and an adjustable member pivoted between the body elements concentric with the transparent windows thereof, said member having an opaque central p portion blanklng the circular transparent portions oi both of said body elements and bearing on opposite sides of said opaque central portion a series of blocks containing indicia designating various work materials, said blocks terminating in indicators proportionally spaced in accordance with the machinabillty characteristics of the several materials designated Within the blocks, means providing rate designatingindicia formed on the opaque portions oi. the body elements for cooperation with said indicators in various rotative adjusted positions of the intermediate member about its pivot, said intermediate member having additional indicia bearing portions visible through arcuate outer transparent portions of the respective body elements and indicating means on the body elements adjacent said windows for cooperation with the indicia on the pivoted member as visible through said arcuate transparent portions, a second rotatable member pivoted concentric with the first intermediate the body elements, said second member having a central transparent portion permitting Visibility therethrough oi the work material designations of the rst pivoted member when the device is viewed trom one side and having a plurality of arcuately arranged indicia on the opposite side including certain indicia disposed for cooperative positioning with. respect to the work material designations on the opposite side, the rst pivoted member having a plurality of transparent portions overlying the indicia of the second pivoted member to permit of visibility of the mem-1 ber therethrough, substantially as and for the purpose described;

6. A device the character described, com.-

1 pricing a pair of rectangular cover members having aligned lateral recesses formed therein and additional. terminal aligned recesses, a pivot member carried by and connecting said cover menicers, a :first circular disc rotatably mounted on said pivoted member and having peripheral portions projecting into the lateral recesses of the cover members for effecting rotary actuation of the disc, an elongated second member mounted on said pivot and having a terminal projecting portion extending into the other of said recesses whereby said member may be oscillated about the pivot by actuation of said projecting portion, both o said cover members having transparent central portions surrounding the pivot and the disc having `a coinciding transparent central portion whereby the central portion of the elongated member is rendered visible from either side of the device, Work material designation blocks formed on both sides of the central portion ci said elongated member, said cover members having auxiliary Windows formed therein, position `determinators formed on opposite sides of the member to selected adjustments as determinedby the position determinators, substantially ag and for the purpose described.

7. A device o! the character described, comprising a pair of rectangular cover members having aligned lateral recesses iormed'thereln and additional terminal aligned recesses. a pivot member carried by and connecting said cover members, a nrst circular disc rotatably mounted on said pivoted member and having peripheral Vportions projecting into the lateral recesses of the cover members for eii'ecting rotary actuation of the disc, an elongated second member mounted on said pivot and having a terminal projecting portion extending into the other of said recesses whereby said member may be oscillated about the pivot by actuation of said projecting portion, both of said cover members having transparent central portions surrounding the pivot and the disc having a coinciding transparent central portion'whereby the central portion of the elongated member is rendered visible from either'side of the device, work material designation .blocks formed on both sides of the central portion o! said elongated member. said cover members having auxiliary windows formed therein, position determinators iormed on opposite sides 'of the elongated member in underlying relation to the vwindows for determination of positional adjustments of said elongated member about its pivot with respect to the cover members, scales formed on the cover members arranged concentrically with the arcuate-path of movement of the work material designating blocks for cooperation therewith upon oscillation of the elongated member to select adjustments as determined by the position determinators, the

cover member adjacent the rotary disc having auxiliary transparent portions or windows formed therein through vwhich selected portions loi' the disc may be viewed and .the elongated members, a first circularrdisc rotatably mounted on said pivoted member and having peripheral portions projecting into the lateral recesses oi the cover members for encctlng rotary actuation of the disc, vau elongated second member mounted on said pivot and having a terminal projecting portion extending into the other'oi said recesses whereby said member may be oscillated about the pivot by actuation o! said projecting portion, both of said cover members having transparent central portions surrounding the pivot and the disc having a coinciding transparent central portion whereby the central portion of the elongated member is rendered visible from either side of the device, work material designation blocks formed on both sides ot the central portion of said elongated member, said cover members v having auxiliary windows formed therein, position determinators formed on opposite sides of the elongated member in underlying relation to the windows for determination of positional adjustments of said elongated member about its pivot with respect to the cover members, scales formed on the cover members arranged concentrically with the arcuate path of movementl of the work material designating blocks for cooperation therewith upon oscillation oi! the elongated member to select adjustments as determined bythe position determinators, the cover member adjacent the rotary disc having auxiliary transparent portions or windows formed therein through which selected portions oi the disc may be viewed and the elongated member having auxiliary transparent portions formed therein in cooperative relation with the -transparent portion of the opposite cover member whereby the lreverse side of the rotary disc may be viewed by way of the cover member and adjacent elongated member, each cover member having formed thereon cooperating sets of position determinators and logarithmic scales in juxtaposition to the disc-viewing windows and the rotary disc having formed on opposite faces thereof opposed sets ol.' logarithmically arranged scales for cooperation with the scales and position determinators on the cover members as the rotary disc is viewed through the respective windows, substantially as and for the purpose described.

HANS ERNST. RAYMOND D. WORTENDYKE. 

